Number of Skolem sequences of order n.

Terms

a(0) =1a(1) =0a(2) =0a(3) =6a(4) =10a(5) =0a(6) =0a(7) =504a(8) =2656a(9) =0a(10) =0a(11) =455936a(12) =3040560a(13) =0a(14) =0a(15) =1400156768a(16) =12248982496a(17) =0a(18) =0a(21) =0a(22) =0a(25) =0a(26) =0a(29) =0a(30) =0